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Microsoft Help and Support says that "Code 28 (The drivers for this device are not installed)" appears when the Windows Sound System Compatible Driver for the Windows 2000 operating system is deleted upon the upgrade to Windows XP. It's possible to repair this code.

Click on "Start." On the "Start" menu, click on "Control Panel." In the "Control Panel" folder, click on "Performance and Maintenance." Click on the "System" folder in the "Performance and Maintenance" folder. Click on the tab titled "Hardware." Click on the box that says "Device Manager." Click on "Sound, Video, and Game Controllers." Right-click on the device that prompts Windows XP to display Code 28 (it should be Windows Sound System Compatible Driver, also called the WDM driver). A drop-down menu will appear. Click on "Update" and an Update Wizard will guide you through the installation of a new device driver, which should stop Code 28 from appearing on Windows XP. or Click start control panel administration tools computer management device manager scroll to sound video and game controllers you might see a yellow question / exclamation? ! mark or a red X Right click to reinstall drivers If your computer came with a motherboard disk the drivers could be on it or you might download slimdrivers. Rather doing a driver hunt http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html Windows XP/Vista/7/8 Note: it will find all of your outdated drivers This is a free driver solutions which will automatically search for and find the correct driver You will have to update every driver individually once you update you might be asked whether you want to restart or make a system restore point. Click no to both of these then continue updating each driver free then restart once all of the drivers have been updated. It might take some time being free

Click start control panel administration tools computer management device manager scroll to sound video and game controllers you might see a yellow question / exclamation? ! mark or a red X Right click to reinstall drivers If your computer came with a motherboard disk the drivers could be on it or you might download slimdrivers. Rather doing a driver hunt http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html Windows XP/Vista/7/8 Note: it will find all of your outdated drivers This is a free driver solutions which will automatically search for and find the correct driver You will have to update every driver individually once you update you might be asked whether you want to restart or make a system restore point. Click no to both of these then continue updating each driver free then restart once all of the drivers have been updated. It might take some time being free also http://download.cnet.com/2000-20_4.html Just type in what you want or need be specific you might have to try a few times to get it right. Tick in either the all software or the windows software box. IE: Motherboard name sound drivers http://download.cnet.com/drivers-for-free/3000-18512_4-75548155.html Windows XP/2003/Vista/Server 2008/7/8 free drivers http://download.cnet.com/drivermax/3000-18513_4-10572602.html Windows 2000/XP/Vista/7/8 free driver program Hope it helps.

Click start control panel administration tools computer management device manager scroll to sound video and game controllers you might see a yellow question / exclamation? ! mark or a red X Right click to reinstall drivers If your computer came with a motherboard disk the drivers could be on it or you might download slimdrivers. Rather doing a driver hunt http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html Windows XP/Vista/7/8 Note: it will find all of your outdated drivers This is a free driver solutions which will automatically search for and find the correct driver You will have to update every driver individually once you update you might be asked whether you want to restart or make a system restore point. Click no to both of these then continue updating each driver free then restart once all of the drivers have been updated. It might take some time being free also http://download.cnet.com/2000-20_4.html Just type in what you want or need be specific you might have to try a few times to get it right. Tick in either the all software or the windows software box. IE: Motherboard name sound drivers http://download.cnet.com/drivers-for-free/3000-18512_4-75548155.html Windows XP/2003/Vista/Server 2008/7/8 free drivers http://download.cnet.com/drivermax/3000-18513_4-10572602.html Windows 2000/XP/Vista/7/8 free driver program Hope it helps.

Above are the links direct to acer driver support and Download. You can download drivers for free both Windows XP, Windows Vista and Windows 7.

But first follow the procedure of Solution #1. Another way if you sound is working before and not yet formatted. You don't need to download a sound drivers. Under the Device Manager >Sound> Type of Sound installed>, then right click and uninstall. After you uninstalled, choose " Scan for Hardware Changes" ( The Blue TV images above) and it automatically installed you sound drivers

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Choose your sound card from one of these links and download it and finally install it.
Good luck
www.opendrivers.com/category/17/soundcard-free-driver-download.htmlwww.driverskit.com/soundcard.free-driver-download.com/

Under MS Windows XP, click the dropdown menu & choose,
Audio Driver Realtek Ver. 5.10.0.5273
A download window will open, click to Save. Creat a folder on you're desktop & name it sound driver. Save the download file into the folder.
If you prefer the MS Windows Vista, do the same as mentioned above.
The downloaded file will be compressed in a .zip format. Use WinZip to uncompress the files into the folder you created.
If you need the program WinZip you can download a free 45 day trial from this link. http://www.download.com/WinZip/3000-2250_4-10003164.html

It is suggest that you check Add/remove programs & unstall any previous sound drivers before installing Acer's driver software. If you sound still does not function, please run windows update service. Code 10 can mean many different things, including you're system may contain a virus.
Explanation of error codes generated by Device Manager in Microsoft Windows XP Professional.http://support.microsoft.com/kb/310123

Good luck!
Hope the Acer driver software gets you're sound to work.
Have more questions? Please feel free to ask.